Crossword Genius

Opinion arrived at in the end (10)

Ross

I believe the answer is:

conclusion

I'm a little stuck... Click here to teach me more about this clue!

'opinion' is the definition.
(I know that conclusion is a type of opinion)

'arrived at in the end' is the wordplay.
I cannot really see how this works, but
'at' could be 'on' (location) and 'on' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for conclusion that I've seen before include "Ending" , "End; decision" .)

I've seen this clue in The Globe and Mail.
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